[DMANET] Rudolf Halin 1934-2014

Many of you will be saddened to hear that Rudolf Halin has died. He passed away on 7 November 2014, having turned 80 only a few months before, on 3 February.

Halin was one of Wagner's three most eminent students. He is best known for his early papers on connectivity, and particularly for his seminal work on infinite graphs and their ends. Throughout his work, Halin was driven by a desire to get to the bottom of things, to find the `essence' of the phenomena that had caught his attention. One of his last papers was a collection of open problems, published in the Journal of Graph Theory, of which most are still unresolved.
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